About the Authors

Thomas N Williams

To whom correspondence should be addressed. E-mail: twilliams@ kilifi.mimcom.net

Affiliations Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom, Department of Paediatrics, John Radcliffe Hospital, Oxford, United Kingdom

Tabitha W Mwangi

Affiliation Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya

David J Roberts

Affiliations Blood Research Laboratory, National Blood Service—Oxford, John Radcliffe Hospital, Oxford, United Kingdom, Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, Oxford, United Kingdom

Neal D Alexander

Affiliation Medical Research Council Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, London, United Kingdom

David J Weatherall

Affiliation Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom

Sammy Wambua

Affiliation Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya

Moses Kortok

Affiliation Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya

Robert W Snow

Affiliations Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom

Kevin Marsh

Affiliations Kenya Medical Research Institute/Wellcome Trust Programme, Centre for Geographic Medicine Research, Coast, Kilifi District Hospital, Kilifi, Kenya, Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

TNW, TWM, DJR, DJW, and KM designed the study. TNW, NDA, SW, and MK analyzed the data. TNW wrote the paper.